Chemical Analysis Flashcards
What is meant by pure?
Nothing has been added to it, so its a natural state
A pure substance in chemistry contains what?
One compound or element throughout - not mixed with anything else
How can you test the purity of a sample?
By measuring its melting or boiling point and comparing it with melting or boiling point of the pure substance.
The closer your measured value is to the actual melting or boiling point, the __________
Purer your sample is
What will impurities do to your solution?
Will lower the melting point and increase the melting range of your substance. Also increase boiling point and may result in your sample boiling at a range of temperature
What is formulation?
Formulations are useful mixtures with a precise purpose that are made by following a formula. Each component in a formulation is present in a measured quantity, and contributes to the properties of the formulation so that it meets its required function.
Why are formulations important in the pharmaceutical industry?
Eg - altering a formulation of a pill, chemists can make sure it delivers the drug to the correct part of the body at the right concentration, that its consumable and has a long enough shelf life.
Where can formulations be found?
Every day life
- cleaning products
- fuels
- cosmetics
- metal alloys
- even food and drink
What is chromatography?
An analytical method used to separate the substances in a mixture. You can then use it to identify the substances
What are the two phases of chromatography?
A mobile phase and a stationary phases
What is the test for chlorine?
Chlorine bleaches damp litmus paper, turning it white.
What is the test for oxygen?
If you put a glowing splint inside a test tube containing oxygen, the oxygen will relight the glowing splint.
What is the test for carbon dioxide?
Limewater test goes cloudy
What is the test for hydrogen?
If you hold a lit splint at the open end of a test tube containing hydrogen, you’ll get a “squeaky pop”
What is the test for carbonate?
Adding a couple of drops of dilute acid. If carbonates are present, carbon dioxide will be released that will turn the limewater cloudy when it bubbles through it.
